Butterfly rear sight



FIG. 1 is a front right side isometric view of a butterfly rear sight in accordance with the new design;

FIG. 2 is a rear right side isometric view thereof;

FIG. 3 is a front left side isometric view thereof;

FIG. 4 is a rear left side isometric view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevational view thereof;

FIG. 7 is a right side elevational view thereof;

FIG. 8 is a rear elevational view thereof;

FIG. 9 is a left side elevational view thereof; and,

FIG. 10 is a bottom plan view thereof. 

CLAIM The ornamental design for a butterfly rear sight, as shown and described. 